US8323310B2 - Vessel sealing jaw with offset sealing surface - Google Patents
Vessel sealing jaw with offset sealing surfaceDownload PDFInfo
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- US8323310B2 US8323310B2US12/569,710US56971009AUS8323310B2US 8323310 B2US8323310 B2US 8323310B2US 56971009 AUS56971009 AUS 56971009AUS 8323310 B2US8323310 B2US 8323310B2
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
- A61B18/04—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating
- A61B18/12—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating by passing a current through the tissue to be heated, e.g. high-frequency current
- A61B18/14—Probes or electrodes therefor
- A61B18/1442—Probes having pivoting end effectors, e.g. forceps
- A61B18/1445—Probes having pivoting end effectors, e.g. forceps at the distal end of a shaft, e.g. forceps or scissors at the end of a rigid rod
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
- A61B2018/00053—Mechanical features of the instrument of device
- A61B2018/00184—Moving parts
- A61B2018/00196—Moving parts reciprocating lengthwise
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
- A61B18/04—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating
- A61B18/12—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating by passing a current through the tissue to be heated, e.g. high-frequency current
- A61B18/14—Probes or electrodes therefor
- A61B2018/1405—Electrodes having a specific shape
- A61B2018/1412—Blade
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
- A61B18/04—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating
- A61B18/12—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating by passing a current through the tissue to be heated, e.g. high-frequency current
- A61B18/14—Probes or electrodes therefor
- A61B18/1442—Probes having pivoting end effectors, e.g. forceps
- A61B2018/1452—Probes having pivoting end effectors, e.g. forceps including means for cutting
- A61B2018/1455—Probes having pivoting end effectors, e.g. forceps including means for cutting having a moving blade for cutting tissue grasped by the jaws
Definitions
- the present disclosurerelates to surgical instruments. More particularly, the present disclosure relates to forceps for sealing and/or cutting tissue.
- Electrosurgical forcepsutilize both mechanical clamping action and electrical energy to effect hemostasis by heating tissue and blood vessels to coagulate, cauterize and/or seal tissue.
- open forcepsfor use with open surgical procedures
- many modern surgeonsuse endoscopic or laparoscopic instruments for remotely accessing organs through smaller, puncture-like incisions or natural orifices. As a direct result thereof, patients tend to benefit from less scarring and reduced healing time.
- Endoscopic instrumentsfor example, are inserted into the patient through a cannula, or port, which has been made with a trocar.
- Typical sizes for cannulasrange from three millimeters to twelve millimeters. Smaller cannulas are usually preferred, which, as can be appreciated, ultimately presents a design challenge to instrument manufacturers who must find ways to make endoscopic instruments that fit through the smaller cannulas.
- a larger vesselis ligated, it may be necessary for the surgeon to convert the endoscopic procedure into an open-surgical procedure and thereby abandon the benefits of endoscopic surgery.
- the surgeoncan seal the larger vessel or tissue.
- the surgeonadvances a knife to sever the sealed tissue disposed between the opposing jaw members.
- the present disclosurerelates to a forceps including a housing having shaft attached thereto.
- the shafthas a longitudinal axis defined therethrough and an end effector assembly disposed at a distal end thereof.
- the end effector assemblyincludes a pair of jaw members disposed in opposing relation relative to one another.
- Each jaw memberhas an opposing sealing surface and one or both of the jaw members is moveable relative to the other about a pivot from a first position to a second position for grasping tissue therebetween.
- the pivotis positioned either coincident or offset from the longitudinal axis defined through the shaft.
- a planeis formed between the opposing sealing surfaces of each of the jaw members.
- the planeis configured to be positioned offset from the longitudinal axis.
- the pivotis offset a distance “X” relative the longitudinal axis, where “X” is preferably in the range of about 0.036′′ to about 0.046′′.
- the plane formed between the opposing sealing surfacesis offset a distance “Y” relative to the longitudinal axis, where “Y” is preferably in the range of about 0.005′′ to about 0.025′′.
- the forcepsfurther includes a knife assembly disposed within the shaft and a knife channel defined within one or both of the jaw members.
- a knife bladeis configured to translate distally from the shaft and extend at least partially through the knife channel(s) to cut tissue disposed between the jaw members.
- the knife blademay be configured such that when the knife blade is translated distally from the shaft through the knife channel(s), the knife blade is offset a distance “Z” relative to the pivot.
- the forcepsfurther includes at least one handle that operably couples to a drive assembly for moving the jaw members between the first and second positions.
- One or both of the jaw membersmay be adapted to connect to an electrosurgical energy source to communicate energy to tissue disposed between the jaw members.
- a forcepsincluding a housing having a shaft attached thereto.
- the shafthas a longitudinal axis defined therethrough and an end effector assembly disposed at a distal end thereof.
- the end effector assemblyincludes first and second jaw members disposed in opposing relation relative to one another.
- Each jaw memberincludes a sealing surface opposed to the sealing surface of the opposing jaw member.
- the first jaw memberis moveable relative to the second jaw member about a pivot from a first position to a second position for grasping tissue therebetween.
- the sealing surface of the second jaw memberis offset relative to the longitudinal axis defined through the shaft.
- the sealing surface of the first jaw memberhas a thickness “T” that forms a substantially parallel plane beyond the longitudinal axis and toward the opposing sealing surface.
- the thickness “T”may be in the range of about 0.105′′ to about 0.120′′.
- FIG. 1is a perspective view of a surgical instrument having an end effector assembly in accordance with an embodiment of the present disclosure
- FIG. 2is a perspective view of an end effector assembly in accordance with an embodiment of the present disclosure
- FIG. 3Ais a schematic view of an end effector assembly in accordance with one embodiment of the present disclosure in which the upper jaw member has been removed;
- FIG. 3Bis a schematic view of the end effector assembly of FIG. 3A where the upper jaw member has been replaced;
- FIG. 4is an exploded, perspective view of the knife assembly in accordance with one embodiment of the present disclosure.
- FIG. 5is a perspective view of the housing with half of the housing enclosure removed;
- FIG. 6is a perspective view of the knife assembly of FIG. 4 ;
- FIG. 7is a perspective view of the lower jaw member and rotating assembly in accordance with the present disclosure.
- distalrefers to the portion that is being described which is further from a user
- proximalrefers to the portion that is being described which is closer to a user
- a forceps 10including a housing 20 , a handle assembly 30 , a rotating assembly 80 , a trigger assembly 70 and an end effector assembly 100 .
- Forceps 10further includes a shaft 12 having a distal end 14 configured to mechanically engage end effector assembly 100 and a proximal end 16 that mechanically engages housing 20 .
- Forceps 10also includes electrosurgical cable 310 that connects forceps 10 to a generator (not shown). Cable 310 has sufficient length to extend through shaft 12 in order to provide electrical energy to at least one of jaw members 110 and 120 of end effector assembly 100 .
- handle assembly 30includes fixed handle 50 and a moveable handle 40 .
- Fixed handle 50is integrally associated with housing 20 and handle 40 is moveable relative to fixed handle 50 .
- Rotating assembly 80is integrally associated with housing 20 and is rotatable approximately 180 degrees in either direction about a longitudinal axis “A.”
- the housing 20includes two halves that house the internal working components of the forceps 10 (see FIG. 5 ).
- end effector assembly 100is shown attached at a distal end 14 of shaft 12 and includes a pair of opposing jaw members 110 and 120 .
- Each of jaw members 110 and 120includes a sealing surface 112 and 122 , respectively, that is dimensioned to oppose the other as shown in FIG. 2 .
- End effector assembly 100is designed as a unilateral assembly, i.e. jaw member 120 is fixed relative to the shaft 12 and jaw member 110 is moveable about a pivot 103 relative to jaw member 120 .
- Moveable handle 40 of handle assembly 30(see FIG. 1 ) is ultimately connected to a drive assembly 150 (see FIG. 5 ) that, together, mechanically cooperate to impart movement of jaw members 110 and 120 from an open position to a clamped position to grasp tissue between sealing surfaces 112 and 122 .
- a knife channel half 115 bis defined through the center of jaw member 120 .
- a corresponding knife channel half(not shown) is defined through the center of jaw member 110 .
- end effector assembly 100is shown in accordance with one embodiment of the present disclosure.
- End effector assembly 100is mechanically engaged to shaft 12 , that defines a longitudinal axis “A” therethrough.
- Jaw member 120is fixed relative to shaft 12 and jaw member 110 is moveable relative to jaw member 120 about pivot 103 .
- pivot 103is offset above longitudinal axis “A” creating a greater mechanical advantage on jaw member 110 as compared to a configuration where the pivot is positioned on the longitudinal axis.
- pivot 103also allows knife blade 185 to pass under pivot pin 104 when the knife blade 185 is advanced distally to cut tissue between jaw member 110 and 120 . More specifically, pivot 103 may be positioned such that knife blade 185 passes a distance “Z” below the pivot pin 104 . Additionally, pivot 103 may be positioned a distance “X” above the longitudinal axis “A” where “X” is in the range of about 0.036′′ to about 0.046′′ to optimize the mechanical advantage and provide an enhanced and uniform tissue seal. However, it is also contemplated that different surgical procedures and/or different surgical instruments may require the pivot 103 to be positioned a distance “X” above the longitudinal axis “A,” where “X” is outside of the range stated above.
- fixed jaw member 120may be configured such that sealing surface 122 of jaw member 120 lies below longitudinal axis “A.” Sealing surface 122 may be positioned a distance “Y” below the longitudinal axis “A” where “V” is preferably in the range of about 0.005′′ to about 0.025′′. However, it is also contemplated that sealing surface 122 be positioned below the longitudinal axis “A” a distance outside the range stated above, depending on the surgical instrument to be used and/or the surgical procedure to be performed.
- fixed jaw member 120may be manufactured with less material, having a thickness “t,” as compared to moveable jaw member 110 , that may be manufactured with more material and have a thickness “T,” greater than the thickness “t” of jaw member 120 .
- no additional materialwould be required to manufacture jaw members 110 and 120 in the above-configuration than would be required if jaw members 110 and 120 had equal thickness. Rather, in theory, the material that is taken from fixed jaw 120 is supplemented to movable jaw 110 .
- Fixed jaw 120remains strong due to the solid core construction thereof, while the strength of moveable jaw 110 is bolstered by the additional material. Such a configuration is advantageous given the forces applied to moveable jaw 110 as a result of the repeated movement of jaw member 110 between the open and the clamped position.
- the thickness “t” of fixed jaw member 120may be in the range of about 0.075′′ to about 0.095′′, while the thickness “T” of moveable jaw member 120 may be in the range of about 0.105′′ to about 0.120′′, although other thicknesses “t” and “T” are contemplated depending on the instrument to be used and/or the procedure to be performed.
- Knife rod 182has a bifurcated distal end comprising prongs 182 a and 182 b that cooperate to receive knife bar 184 therein.
- the knife assembly 140also includes a proximal end 183 that is keyed to facilitate insertion into tube 160 of rotating assembly 80 (see FIG. 7 ).
- Knife wheel 148is secured to the knife bar via pin 143 .
- Knife wheel 148includes rings 141 a and 141 b that define a drive slot 147 therebetween.
- the knife rod 182includes apertures 181 a and 181 b ; aperture 181 a is used, as shown, to receive and secure the knife wheel 148 to the knife rod 182 via pin 143 such that longitudinal reciprocation of the knife wheel 148 , in turn, moves the knife rod 182 .
- Knife bar 184includes knife support 188 at a distal end thereof, with knife blade 185 being welded to knife support 188 .
- FIG. 5shows the details of the housing 20 and the internal components thereof, namely, the drive assembly 150 , the trigger assembly 70 , and the handles 40 and 50 . More particularly, FIG. 5 shows the above-identified assemblies and components in an assembled form in the housing 20 .
- trigger assembly 70cooperates with the knife assembly 140 (see FIG. 4 ) to selectively translate knife 185 through knife channel 115 (see FIG. 3 ).
- the trigger assembly 70includes a finger actuator 71 and a U-shaped upwardly-extending flange 74 having legs 74 a and 74 b .
- a pivot pin 73mounts the trigger assembly 70 between housing halves 20 a and 20 b for selective rotation thereof.
- Legs 74 a and 74 b of the U-shaped flange 74each include a respective slot 78 a and 78 b defined therein that are each dimensioned to receive a free end of an elongated drive bar 75 .
- Drive bar 75is dimensioned to sit within a drive slot 147 (see FIG. 4 ) defined in knife assembly 140 explained above.
- the trigger assembly 70is mounted atop the knife wheel 148 of the knife assembly 140 .
- Proximal activation of the finger actuator 71rotates the trigger assembly 70 about pivot pin 73 which, in turn, forces the drive bar 75 distally to ultimately extend the knife 185 through knife channel 115 .
- a spring 350biases the knife assembly 140 in a retracted position such that once advancement of the knife 185 is complete, the knife 185 and the knife assembly 140 are automatically returned to a proximal pre-firing position.
- knife assembly 140as discussed in detail above, is shown including knife wheel 148 engaging aperture 181 a of knife rod 182 .
- knife rod 182is inserted into tube 160 , whereby knife wheel 148 surrounds tube 160 with pin 143 passing through slot 162 of tube 160 and aperture 181 a of knife rod 182 , mechanically engaging knife wheel 148 thereon.
- proximal activation of finger actuator 71causes longitudinal reciprocation of knife wheel 148 , which, in turn, moves knife rod 182 distally as pin 143 translates distally along slot 162 of tube 160 .
- Slot 162 of tube 160includes proximal end 162 a and distal end 162 b .
- Slot 162may be dimensioned so that proximal end 162 a acts as a stop for pin 143 as knife rod 182 is retracted proximally, providing the at-rest position of knife rod 182 .
- knife wheel 148 and therefore knife 185are retracted proximally until pin 143 contacts proximal end 162 a of slot 160 , thereby preventing further movement thereof.
- pin 143absorbs the retract force as knife wheel 148 retracts under force from spring 350 and slot end 162 a prevents further proximal retraction.
- Pin 143would thus remain in an at-rest position, at proximal end 162 a of slot 162 under the biasing force from spring 350 until finger actuator 71 is activated, thereby advancing knife 185 distally, as described above.
- the proximal end 162 a of shaft 162may be configured to prevent proximal translation of the knife 185 beyond a proximal end of the knife channel 115 thereby preventing a potential misfire of the knife blade 185 .
- proximal end 162 a of slot 162prevents the knife blade 185 from retracting proximally beyond the proximal end of the knife channel 115 assuring that, upon activation, the knife blade 185 will advance properly within the knife channel 115 and through tissue. Maintaining the knife blade 185 within the proximal end of the knife channel 115 also prevents unnecessary damage to the knife blade 185 and essentially eliminates mis-firing.
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Abstract
Description
The present disclosure relates to surgical instruments. More particularly, the present disclosure relates to forceps for sealing and/or cutting tissue.
Electrosurgical forceps utilize both mechanical clamping action and electrical energy to effect hemostasis by heating tissue and blood vessels to coagulate, cauterize and/or seal tissue. As an alternative to open forceps for use with open surgical procedures, many modern surgeons use endoscopic or laparoscopic instruments for remotely accessing organs through smaller, puncture-like incisions or natural orifices. As a direct result thereof, patients tend to benefit from less scarring and reduced healing time.
Endoscopic instruments, for example, are inserted into the patient through a cannula, or port, which has been made with a trocar. Typical sizes for cannulas range from three millimeters to twelve millimeters. Smaller cannulas are usually preferred, which, as can be appreciated, ultimately presents a design challenge to instrument manufacturers who must find ways to make endoscopic instruments that fit through the smaller cannulas.
Many endoscopic surgical procedures require cutting or ligating blood vessels or vascular tissue. Due to the inherent spatial considerations of the surgical cavity, surgeons often have difficulty suturing vessels or performing other traditional methods of controlling bleeding, e.g., clamping and/or tying-off transected blood vessels. By utilizing an endoscopic electrosurgical forceps, a surgeon can either cauterize, coagulate/desiccate and/or simply reduce or slow bleeding simply by controlling the intensity, frequency and duration of the electrosurgical energy applied through the jaw members to the tissue. Most small blood vessels, i.e., in the range below two millimeters in diameter, can often be closed using standard electrosurgical instruments and techniques. However, if a larger vessel is ligated, it may be necessary for the surgeon to convert the endoscopic procedure into an open-surgical procedure and thereby abandon the benefits of endoscopic surgery. Alternatively, the surgeon can seal the larger vessel or tissue. Typically, after a vessel or tissue is sealed, the surgeon advances a knife to sever the sealed tissue disposed between the opposing jaw members.
The present disclosure relates to a forceps including a housing having shaft attached thereto. The shaft has a longitudinal axis defined therethrough and an end effector assembly disposed at a distal end thereof. The end effector assembly includes a pair of jaw members disposed in opposing relation relative to one another. Each jaw member has an opposing sealing surface and one or both of the jaw members is moveable relative to the other about a pivot from a first position to a second position for grasping tissue therebetween. The pivot is positioned either coincident or offset from the longitudinal axis defined through the shaft. When the jaw members are disposed in the second position, a plane is formed between the opposing sealing surfaces of each of the jaw members. The plane is configured to be positioned offset from the longitudinal axis.
In one embodiment, the pivot is offset a distance “X” relative the longitudinal axis, where “X” is preferably in the range of about 0.036″ to about 0.046″.
In another embodiment, the plane formed between the opposing sealing surfaces is offset a distance “Y” relative to the longitudinal axis, where “Y” is preferably in the range of about 0.005″ to about 0.025″.
In yet another embodiment, the forceps further includes a knife assembly disposed within the shaft and a knife channel defined within one or both of the jaw members. Upon activation, a knife blade is configured to translate distally from the shaft and extend at least partially through the knife channel(s) to cut tissue disposed between the jaw members. The knife blade may be configured such that when the knife blade is translated distally from the shaft through the knife channel(s), the knife blade is offset a distance “Z” relative to the pivot.
In still yet another embodiment, the forceps further includes at least one handle that operably couples to a drive assembly for moving the jaw members between the first and second positions. One or both of the jaw members may be adapted to connect to an electrosurgical energy source to communicate energy to tissue disposed between the jaw members.
In accordance with another embodiment of the present disclosure, a forceps is provided including a housing having a shaft attached thereto. The shaft has a longitudinal axis defined therethrough and an end effector assembly disposed at a distal end thereof. The end effector assembly includes first and second jaw members disposed in opposing relation relative to one another. Each jaw member includes a sealing surface opposed to the sealing surface of the opposing jaw member. The first jaw member is moveable relative to the second jaw member about a pivot from a first position to a second position for grasping tissue therebetween. The sealing surface of the second jaw member is offset relative to the longitudinal axis defined through the shaft.
In one embodiment, the sealing surface of the first jaw member has a thickness “T” that forms a substantially parallel plane beyond the longitudinal axis and toward the opposing sealing surface. The thickness “T” may be in the range of about 0.105″ to about 0.120″.
Various embodiments of the presently disclosed forceps are described herein with reference to the drawings, wherein:
Embodiments of the presently disclosed surgical instrument are described in detail with reference to the drawing figures wherein like reference numerals identify similar or identical elements. As used herein, the term “distal” refers to the portion that is being described which is further from a user, while the term “proximal” refers to the portion that is being described which is closer to a user.
Turning now toFIG. 1 , aforceps 10 is provided including ahousing 20, ahandle assembly 30, arotating assembly 80, atrigger assembly 70 and anend effector assembly 100.Forceps 10 further includes ashaft 12 having adistal end 14 configured to mechanically engageend effector assembly 100 and aproximal end 16 that mechanically engageshousing 20.Forceps 10 also includeselectrosurgical cable 310 that connectsforceps 10 to a generator (not shown). Cable310 has sufficient length to extend throughshaft 12 in order to provide electrical energy to at least one ofjaw members end effector assembly 100.
With continued reference toFIG. 1 ,handle assembly 30 includesfixed handle 50 and amoveable handle 40. Fixedhandle 50 is integrally associated withhousing 20 andhandle 40 is moveable relative tofixed handle 50.Rotating assembly 80 is integrally associated withhousing 20 and is rotatable approximately 180 degrees in either direction about a longitudinal axis “A.” Thehousing 20 includes two halves that house the internal working components of the forceps10 (seeFIG. 5 ).
Turning now toFIG. 2 ,end effector assembly 100 is shown attached at adistal end 14 ofshaft 12 and includes a pair of opposingjaw members jaw members surface FIG. 2 .End effector assembly 100 is designed as a unilateral assembly, i.e.jaw member 120 is fixed relative to theshaft 12 andjaw member 110 is moveable about apivot 103 relative tojaw member 120.Moveable handle 40 of handle assembly30 (seeFIG. 1 ) is ultimately connected to a drive assembly150 (seeFIG. 5 ) that, together, mechanically cooperate to impart movement ofjaw members surfaces
As illustrated inFIG. 2 , aknife channel half 115bis defined through the center ofjaw member 120. A corresponding knife channel half (not shown) is defined through the center ofjaw member 110. Whenjaw members FIG. 3B ), such that ablade 185 of a knife assembly140 (seeFIG. 4 ) can translate distally therethrough cutting tissue grasped between thejaw members
With reference now toFIGS. 3A-B ,end effector assembly 100 is shown in accordance with one embodiment of the present disclosure.End effector assembly 100 is mechanically engaged toshaft 12, that defines a longitudinal axis “A” therethrough.Jaw member 120 is fixed relative toshaft 12 andjaw member 110 is moveable relative tojaw member 120 aboutpivot 103. As shown,pivot 103 is offset above longitudinal axis “A” creating a greater mechanical advantage onjaw member 110 as compared to a configuration where the pivot is positioned on the longitudinal axis. The positioning ofpivot 103 offset above longitudinal axis “A” as shown inFIGS. 3A-3B , also allowsknife blade 185 to pass underpivot pin 104 when theknife blade 185 is advanced distally to cut tissue betweenjaw member knife blade 185 passes a distance “Z” below thepivot pin 104. Additionally, pivot103 may be positioned a distance “X” above the longitudinal axis “A” where “X” is in the range of about 0.036″ to about 0.046″ to optimize the mechanical advantage and provide an enhanced and uniform tissue seal. However, it is also contemplated that different surgical procedures and/or different surgical instruments may require thepivot 103 to be positioned a distance “X” above the longitudinal axis “A,” where “X” is outside of the range stated above.
With continued reference toFIGS. 3A-3B , fixedjaw member 120 may be configured such that sealingsurface 122 ofjaw member 120 lies below longitudinal axis “A.”Sealing surface 122 may be positioned a distance “Y” below the longitudinal axis “A” where “V” is preferably in the range of about 0.005″ to about 0.025″. However, it is also contemplated that sealingsurface 122 be positioned below the longitudinal axis “A” a distance outside the range stated above, depending on the surgical instrument to be used and/or the surgical procedure to be performed. As a result of sealingsurface 122 being positioned below the longitudinal axis “A,” whenmoveable jaw member 110 is moved into the clamped position to grasp tissue therebetween, the plane created between sealingsurfaces jaw member 120 may be manufactured with less material, having a thickness “t,” as compared tomoveable jaw member 110, that may be manufactured with more material and have a thickness “T,” greater than the thickness “t” ofjaw member 120. In other words, no additional material would be required to manufacturejaw members jaw members jaw 120 is supplemented tomovable jaw 110.Fixed jaw 120 remains strong due to the solid core construction thereof, while the strength ofmoveable jaw 110 is bolstered by the additional material. Such a configuration is advantageous given the forces applied tomoveable jaw 110 as a result of the repeated movement ofjaw member 110 between the open and the clamped position.
The thickness “t” of fixedjaw member 120 may be in the range of about 0.075″ to about 0.095″, while the thickness “T” ofmoveable jaw member 120 may be in the range of about 0.105″ to about 0.120″, although other thicknesses “t” and “T” are contemplated depending on the instrument to be used and/or the procedure to be performed.
The combination of the offsetpivot 103 about the longitudinal axis “A” and thebottom seal plate 122 being disposed below the longitudinal axis “A” produces a tip-biased jaw design which enhances a uniform and consistent seal. In other words, during the movement to the closed and grasping configuration, thedistal tips jaw members jaw members drive assembly 150 deflects the proximal portion ofjaw member 110 into contact withjaw member 120 thereafter. Manufacturing thejaw members jaw members
Referring now toFIGS. 4 and 6 ,knife assembly 140 is shown includingknife rod 182,knife bar 184 andknife wheel 148.Knife rod 182 has a bifurcated distalend comprising prongs knife bar 184 therein. Theknife assembly 140 also includes aproximal end 183 that is keyed to facilitate insertion intotube 160 of rotating assembly80 (seeFIG. 7 ).Knife wheel 148 is secured to the knife bar viapin 143.Knife wheel 148 includesrings drive slot 147 therebetween. Theknife rod 182 includesapertures aperture 181ais used, as shown, to receive and secure theknife wheel 148 to theknife rod 182 viapin 143 such that longitudinal reciprocation of theknife wheel 148, in turn, moves theknife rod 182.Knife bar 184 includesknife support 188 at a distal end thereof, withknife blade 185 being welded toknife support 188.
Referring now toFIG. 5 , which shows the details of thehousing 20 and the internal components thereof, namely, thedrive assembly 150, thetrigger assembly 70, and thehandles FIG. 5 shows the above-identified assemblies and components in an assembled form in thehousing 20.
As shown inFIG. 5 ,trigger assembly 70 cooperates with the knife assembly140 (seeFIG. 4 ) to selectively translateknife 185 through knife channel115 (seeFIG. 3 ). Thetrigger assembly 70 includes afinger actuator 71 and a U-shaped upwardly-extending flange74 havinglegs pivot pin 73 mounts thetrigger assembly 70 betweenhousing halves 20aand20bfor selective rotation thereof.Legs respective slot elongated drive bar 75. Drivebar 75, in turn, is dimensioned to sit within a drive slot147 (seeFIG. 4 ) defined inknife assembly 140 explained above. Thetrigger assembly 70 is mounted atop theknife wheel 148 of theknife assembly 140. Proximal activation of thefinger actuator 71 rotates thetrigger assembly 70 aboutpivot pin 73 which, in turn, forces thedrive bar 75 distally to ultimately extend theknife 185 throughknife channel 115. Aspring 350 biases theknife assembly 140 in a retracted position such that once advancement of theknife 185 is complete, theknife 185 and theknife assembly 140 are automatically returned to a proximal pre-firing position.
Turning now toFIGS. 6-7 ,knife assembly 140, as discussed in detail above, is shown includingknife wheel 148 engagingaperture 181aofknife rod 182. Upon assembly offorceps 10,knife rod 182 is inserted intotube 160, wherebyknife wheel 148 surroundstube 160 withpin 143 passing throughslot 162 oftube 160 andaperture 181aofknife rod 182, mechanically engagingknife wheel 148 thereon. As discussed above, proximal activation offinger actuator 71 causes longitudinal reciprocation ofknife wheel 148, which, in turn, movesknife rod 182 distally aspin 143 translates distally alongslot 162 oftube 160.
Slot162 oftube 160 includesproximal end 162aanddistal end 162b.Slot 162 may be dimensioned so thatproximal end 162aacts as a stop forpin 143 asknife rod 182 is retracted proximally, providing the at-rest position ofknife rod 182. In such a configuration, after actuation ofknife 185,knife wheel 148 and thereforeknife 185 are retracted proximally untilpin 143 contactsproximal end 162aofslot 160, thereby preventing further movement thereof. Accordingly,pin 143 absorbs the retract force asknife wheel 148 retracts under force fromspring 350 and slot end162aprevents further proximal retraction.Pin 143 would thus remain in an at-rest position, atproximal end 162aofslot 162 under the biasing force fromspring 350 untilfinger actuator 71 is activated, thereby advancingknife 185 distally, as described above. As such, theproximal end 162aofshaft 162 may be configured to prevent proximal translation of theknife 185 beyond a proximal end of theknife channel 115 thereby preventing a potential misfire of theknife blade 185.
More particularly, theproximal end 162aofslot 162 prevents theknife blade 185 from retracting proximally beyond the proximal end of theknife channel 115 assuring that, upon activation, theknife blade 185 will advance properly within theknife channel 115 and through tissue. Maintaining theknife blade 185 within the proximal end of theknife channel 115 also prevents unnecessary damage to theknife blade 185 and essentially eliminates mis-firing.
Although the foregoing disclosure has been described in some detail by way of illustration and example, for purposes of clarity or understanding, it will be obvious that certain changes and modifications may be practiced within the scope of the appended claims.
Claims (19)
1. A forceps, comprising:
a shaft having a longitudinal axis defined therethrough and an end effector assembly disposed at a distal end thereof, the end effector assembly including:
a pair of jaw members disposed in opposing relation relative to one another, each jaw member having an opposing sealing surface, at least one jaw member pivotable relative to the other about a pivot pin from a first position to a second position for grasping tissue therebetween;
wherein the pivot pin is offset in a first direction from the longitudinal axis; and
wherein, when the jaw members are disposed in the second position, a plane is formed between the opposing sealing surfaces, the plane offset in a second, opposite direction from the longitudinal axis.
2. The forceps according toclaim 1 , wherein the pivot pin is offset a distance “X” relative to the longitudinal axis, wherein “X” is in the range of about 0.036″ to about 0.046″.
3. The forceps according toclaim 1 , wherein the plane is offset a distance “Y” relative to the longitudinal axis, wherein “Y” is in the range of about 0.005″ to about 0.025″.
4. The forceps according toclaim 1 , further comprising a knife assembly disposed within the shaft and a knife channel defined within at least one of the jaw members wherein, upon activation, a knife blade is configured to translate distally from the shaft and extend at least partially through the at least one knife channel to cut tissue disposed between the jaw members.
5. The forces according toclaim 4 , wherein when the knife blade is translated distally from the shaft and at least partially through the at least one knife channel, the knife blade is offset a distance “Z” relative to the pivot pin.
6. The forceps according toclaim 1 , wherein the forceps includes at least one handle that operably couples to a drive assembly for moving the jaw members between the first and second positions.
7. The forceps according toclaim 1 , wherein at least one of the jaw members is adapted to connect to an electrosurgical energy source to communicate energy to tissue disposed between the jaw members.
8. The forceps according toclaim 1 , wherein one of the jaw members is fixed relative to the shaft and the other jaw member is pivotable about the pivot pin and relative to the fixed jaw member and the shaft between the first and second positions.
9. The forceps according toclaim 8 , wherein the pivot pin is offset relative to the longitudinal axis in a direction towards the pivotable jaw member and wherein the plane is offset relative to the longitudinal axis in a direction towards the fixed jaw member.
10. A forceps, comprising:
a shaft having a longitudinal axis defined therethrough and an end effector assembly disposed at a distal end thereof, the end effector assembly including:
first and second jaw members disposed in opposing relation relative to one another, each jaw member including a sealing surface opposed to the sealing surface of the opposing jaw member, the second jaw member fixed relative to the shaft, the first jaw member pivotable relative to the second jaw member about a pivot pin from a first position to a second position for grasping tissue therebetween;
wherein the pivot pin is offset in a first direction relative to the longitudinal axis and wherein the sealing surface of the second jaw member defines a first plane that is offset in a second, opposite direction relative to the longitudinal axis.
11. The forceps according toclaim 10 , wherein the first, pivotable jaw member includes a thickness “T” such that the sealing surface of the first, pivotable jaw member forms a substantially parallel second plane beyond the longitudinal axis and toward the opposing sealing surface.
12. The forceps according toclaim 11 , wherein the thickness “T” is in the range of about 0.105″ to about 0.120″.
13. The forceps according toclaim 11 , wherein the second, fixed jaw member defines a thickness “t” that is smaller than the thickness “T” of the first, pivotable jaw member.
14. The forceps according toclaim 13 , wherein the thickness “t” is in the range of about 0.0075″ to about 0.095″.
15. The forceps according toclaim 10 , wherein the pivot pin is offset relative to the longitudinal axis in a direction towards the pivotable jaw member and wherein the sealing surface of the second jaw member is offset relative to the longitudinal axis in a direction towards the second jaw member.
16. A forceps, comprising:
a shaft defining a longitudinal axis;
an end effector assembly disposed at a distal end of the shaft, the end effector assembly including:
first and second jaw members pivotably coupled to one another about a pivot pin, each jaw member defining an opposed sealing surface, at least one of the jaw members pivotable relative to the other between an open position and a clamped position for grasping tissue therebetween, wherein, in the clamped position, a plane is formed between the opposed sealing surfaces, and
wherein, the longitudinal axis extends between the pivot pin and the plane.
17. The forceps according toclaim 16 , wherein the first jaw member defines a thickness “T” and wherein the second jaw member defines a thickness “t” that is smaller than the thickness “T.”
18. The forceps according toclaim 17 , wherein the plane is offset a distance “Y” relative to the longitudinal axis, and wherein the distance “Y” is equal to a difference between the thickness “T” the thickness “t.”
19. The forceps according toclaim 16 , wherein the second jaw member is fixed relative to the shaft and wherein the first jaw member is pivotable relative to the second jaw member and the shaft.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US12/569,710US8323310B2 (en) | 2009-09-29 | 2009-09-29 | Vessel sealing jaw with offset sealing surface |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US12/569,710US8323310B2 (en) | 2009-09-29 | 2009-09-29 | Vessel sealing jaw with offset sealing surface |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| US20110077649A1 US20110077649A1 (en) | 2011-03-31 |
| US8323310B2true US8323310B2 (en) | 2012-12-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US12/569,710Active2031-04-09US8323310B2 (en) | 2009-09-29 | 2009-09-29 | Vessel sealing jaw with offset sealing surface |
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| Country | Link |
|---|---|
| US (1) | US8323310B2 (en) |
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